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对分别加入0%、2%和4%燃速催化剂Ct的某推进剂A、B、C 3个体系,应用低场核磁共振技术(LF-NMR)分别在线监测50、60、70℃固化反应,通过聚合物氢质子横向弛豫时间T2进行固化反应动力学研究。结果显示,T2与体系固化反应程度有相关性,可在线监测样品固化反应的初期、中期和末期;3个体系在反应初期、中期均表现为一级动力学反应;各体系的反应初期的表观反应活化能Ea均大于反应中期,说明2个阶段的反应机理不同;提高固化温度能增加反应速率常数k、缩短固化时间,但不影响固化反应规则,没有改变交联网络的组成;同一固化温度下,随着Ct含量增大,k值增加、固化时间缩短,说明Ct对固化反应有催化作用,含量越高,催化作用越大,但过多的Ct会影响交联剂体系的链反应规则,一定程度上改变了推进剂的空间网络结构。
Three solid propellant A, B, C systems with 0%, 2% and 4% burning rate catalyst Ct were respectively monitored by low-field nuclear magnetic resonance (LF-NMR) , Through the hydrogen proton transverse relaxation time T2 for curing reaction kinetics. The results showed that there was a correlation between T2 and the degree of curing reaction of the system, and the initial, middle and end stages of the sample curing reaction could be monitored online. The three systems showed first-order kinetic reaction at the initial and middle stages of the reaction. The reaction activation energy Ea is larger than the middle of the reaction, indicating that the two stages of the reaction mechanism is different; increasing the curing temperature can increase the reaction rate constant k, shorten the curing time, but does not affect the curing reaction rules, did not change the composition of the crosslinked network; the same curing Temperature, with the increase of Ct content, k value increases, the curing time is shortened, indicating that Ct has a catalytic effect on the curing reaction, the higher the content, the greater the catalytic effect, but too much Ct will affect the chain reaction of the crosslinking system Rules, to some extent, changed the propellant space network structure.